42135239 has 2 divisors, whose sum is σ = 42135240. Its totient is φ = 42135238.

The previous prime is 42135211. The next prime is 42135251. The reversal of 42135239 is 93253124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42135239 is a prime.

It is a Chen prime.

It is equal to p_2555309 and since 42135239 and 2555309 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42135259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21067619 + 21067620.

It is an arithmetic number, because the mean of its divisors is an integer number (21067620).

Almost surely, 2^42135239 is an apocalyptic number.

42135239 is a deficient number, since it is larger than the sum of its proper divisors (1).

42135239 is an equidigital number, since it uses as much as digits as its factorization.

42135239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 42135239 is about 6491.1662280364. The cubic root of 42135239 is about 347.9753555235.

The spelling of 42135239 in words is "forty-two million, one hundred thirty-five thousand, two hundred thirty-nine".